Commonly referred to as the finish hex nut, the hex nut is the most used nut in industrial and commercial applications. These hexagon shaped nuts can be used with all types if machine-thread fasteners including anchors, bolts, screws, studs and threaded rod. The hex nut is used with other fasteners ? typically a bolt ? to close or complete a fastening. Hex nuts come in zinc, plain, stainless steel and galvanized finishes to provide a long lasting durability.